add list of supported countries

docs/supported_countries.txt

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+Afghanistan
+Albania
+Algeria
+American Samoa
+Andorra
+Angola
+Anguilla
+Antigua and Barbuda
+Argentina
+Armenia
+Aruba
+Australia
+Austria
+Azerbaijan
+Bahamas
+Bahrain
+Bangladesh
+Barbados
+Belarus
+Belgium
+Belize
+Benin
+Bermuda
+Bhutan
+Bolivia
+Bosnia and Herzegovina
+Botswana
+Brazil
+Brunei
+Bulgaria
+Burkina Faso
+Burundi
+Cambodia
+Cameroon
+Canada
+Cape Verde
+Cayman Islands
+Central Africa
+Chad
+Chile
+China
+Colombia
+Comoros
+Congo
+Cook Islands
+Costa Rica
+Croatia
+Cuba
+Cyprus
+Czech Republic
+Denmark
+Djibouti
+Dominica
+Dominican Republic
+DR Congo
+East Timor
+Ecuador
+Egypt
+El Salvador
+Equatorial Guinea
+Eritrea
+Estonia
+Ethiopia
+Falkland Islands
+Faroe Islands
+Fiji
+Finland
+France
+French Guiana
+French Polynesia
+Gabon
+Gambia
+Georgia
+Germany
+Ghana
+Gibraltar
+Greece
+Greenland
+Grenada
+Guadeloupe
+Guam
+Guatemala
+Guernsey
+Guinea
+Guinea-Bissau
+Guyana
+Haiti
+Honduras
+Hong Kong
+Hungary
+Iceland
+India
+Indonesia
+Iran
+Iraq
+Ireland
+Israel
+Italy
+Ivory Coast
+Jamaica
+Japan
+Jersey
+Jordan
+Kenya
+Korea Republic of
+Kuwait
+Kyrgyzstan
+Laos PDR
+Latvia
+Lebanon
+Lesotho
+Liberia
+Libya
+Liechtenstein
+Lithuania
+Luxembourg
+Macau
+Macedonia
+Madagascar
+Malawi
+Malaysia
+Maldives
+Mali
+Malta
+Marshall Islands
+Martinique
+Mauritania
+Mauritius
+Mexico
+Micronesia
+Moldova
+Monaco
+Mongolia
+Montenegro
+Montserrat
+Morocco
+Mozambique
+Myanmar
+Namibia
+Nepal
+Netherlands
+Netherlands Antilles
+New Caledonia
+New Zealand
+Nicaragua
+Niger
+Nigeria
+Niue
+Norfolk Island
+Norway
+Oman
+Pakistan
+Palau
+Palestinian Territory
+Panama
+Papua New Guinea
+Paraguay
+Peru
+Philippines
+Poland
+Portugal
+Puerto Rico
+Qatar
+Reunion/Mayotte
+Romania
+Russia
+Rwanda
+Samoa
+San Marino
+Sao Tome and Principe
+Saudi Arabia
+Senegal
+Serbia
+Seychelles
+Sierra Leone
+Singapore
+Slovakia
+Slovenia
+Solomon Islands
+Somalia
+South Africa
+South Sudan
+Spain
+Sri Lanka
+St Kitts and Nevis
+St Lucia
+St Pierre and Miquelon
+St Vincent Grenadines
+Sudan
+Suriname
+Swaziland
+Sweden
+Switzerland
+Syria
+Taiwan
+Tajikistan
+Tanzania
+Thailand
+Togo
+Tonga
+Trinidad and Tobago
+Tunisia
+Turkey
+Turkmenistan
+Turks and Caicos Islands
+Tuvalu
+Uganda
+Ukraine
+United Arab Emirates
+United Kingdom
+United States
+Uruguay
+Uzbekistan
+Vanuatu
+Venezuela
+Vietnam
+Virgin Islands, British
+Virgin Islands, U.S.
+Yemen
+Zambia
+Zimbabwe